Kostyantyn
The Ukrainian form of Konstantin, from a Greek root meaning "constant, steadfast". Fewer than 400 men in Poland carry it, and it barely reaches newborns: most Poles have never met one.
Kostyantyn Pronunciation
Kostyantyn is pronounced kos-tih-AHN-tihn (/kɔstɨˈantɨn/).
What Kostyantyn means
Where Kostyantyn comes from and what it has meant to the people who carry it.
Kostyantyn is the Ukrainian form of a name that Greek shaped as Konstantinos, and it means constant, steadfast. Polish uses the variant Konstanty, while Kostek serves as the everyday short form. The name traces back to the Latin constans, standing firm, which passed into Greek and then across the Orthodox world.
Emperor Constantine lent his name to Constantinople, and from that city the Greek Konstantinos travelled north and east. Ukrainian speakers softened it into Kostyantyn. The steadfast meaning was there in the root already, not attached to the name afterward.
Picture a class register in a Polish school, where a Kostek answers to a name Ukrainian by association and Greek by shape. The feminine Konstancja grows from the same stock. Some names promise beauty. This one promises to hold firm, and its short form Kostek says so plainly.
How many people are named Kostyantyn
1 in 54875 men in Poland is named Kostyantyn. 389 people carry it in the 2025 register: rank #1505 among male names.
Kostyantyn's popularity over time
Fewer than 2 boys were given the name in 2025. It has been climbing since 2025.